This window shows St. John the Evangelist looking off into the distance, as if lost in a vision. (An evangelist is one who carries the message of "Good News" about Jesus Christ.) John and his brother James, sons of Zebedee, were members of the original twelve apostles of Jesus. John is holding an open book in his left hand and a writing implement in his right.
John wrote the Gospel and 3 letters that bear his name in the New Testament. Tradition affirms that he also wrote the book of the Revelation of Jesus Christ, a poetic and symbolic apocalyptic account of the visions given to John concerning the return of Jesus Christ at the end of time.
At the very end of John's Gospel he wrote:
"Jesus performed many other signs in the presence of his disciples, which are not recorded in this book. But these are written that you may believe that Jesus is the Messiah, the Son of God, and that by believing you may have life in His name."
The Paxton Window was given in memory of William Miller Paxton (1824-1904), who served as the fourth minister of First Presbyterian Church of Pittsburgh from 1851 to 1865.